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On my 15 and some customers LML's I have tuned. If I stand on it it will go well up over 120 but if I let off it has no power still it get back below 75-80. I know this has something to do with the switches but have yet to come up with the right combo for this one issue yet. any help. I have the fuel tables set to 0 for the speed limiter also.
I'm not sure if the 2500/3500s are the same, but on the 14 and newer 1500s the speed limiter is controlled by the BCM unless it's set to ECM in the ECM tune.
Jay
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Bumping this thread to see what others have figured out, the 15.5 im messing with is doing the same as Lee's but I can run this one up to 90 let off and it will not pick power back up unless I drop speed below 55mph, maybe a switch combo along with some changes in the speedo limiter parameters will do the trick? I see the 15.5s have misc parameters so maybe raising those numbers along with the PTO, Can Bus speed limits hopefully fixes the issue, if anyone could chime in i would sure appreciate it! Thanks